数字农科院2.0

Watermelon domestication was shaped by stepwise selection and regulation of the metabolome

文献类型： 外文期刊

作者： Yuan, Pingli;Xu, Congping;He, Nan;Lu, Xuqiang;Zhang, Xingping;Shang, Jianli;Zhu, Hongju;Gong, Chengsheng;Kuang, Hanhui;Tang, Tang;Xu, Yong;Ma, Shuangwu;Sun, Dexi;Zhang, Weiqin;Umer, Muhammad J.;Shi, Jian;Fernie, Alisdair R.;Liu, Wenge;Lu

作者机构：

关键词： metabolome;mGWAS;gene cluster;domestication;cucurbitacin biosynthesis

期刊名称： SCIENCE CHINA-LIFE SCIENCES

ISSN： 1674-7305

年卷期： 2022 年

页码：

收录情况： SCIE（2022版） ; ; CSCD（2021-2022年度） ; ; 科技核心（2021版）

摘要： Although crop domestication has greatly aided human civilization, the sequential domestication and regulation of most quality traits remain poorly understood. Here, we report the stepwise selection and regulation of major fruit quality traits that occurred during watermelon evolution. The levels of fruit cucurbitacins and flavonoids were negatively selected during speciation, whereas sugar and carotenoid contents were positively selected during domestication. Interestingly, fruit malic acid and citric acid showed the opposite selection trends during the improvement. We identified a novel gene cluster (CGC1, cucurbitacin gene cluster on chromosome 1) containing both regulatory and structural genes involved in cucurbitacin biosynthesis, which revealed a cascade of transcriptional regulation operating mechanisms. In the CGC1, an allele caused a single nucleotide change in ClERF1 binding sites (GCC-box) in the promoter of ClBh1, which resulted in reduced expression of ClBh1 and inhibition of cucurbitacin synthesis in cultivated watermelon. Functional analysis revealed that a rare insertion of 244 amino acids, which arose in C. amarus and became fixed in sweet watermelon, in ClOSC (oxidosqualene cyclase) was critical for the negative selection of cucurbitacins during watermelon evolution. This research provides an important resource for metabolomics-assisted breeding in watermelon and for exploring metabolic pathway regulation mechanisms.

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